package cn.webrx;

class Demo {
    int id; /*属性*/


    /*  入口方法 */
    public static void mani(String[] args) {
      int n;
      n = 6;
      int[] arr = new int[3];
        System.out.println(arr[2]);
        System.out.println(n);

        Demo d = new Demo();
        d.id = 100;
        System.out.println(d.id);
    }
}
